<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <!-- React核心包 最先引入 提供一个对象React -->
     <script src="../react18/react.development.js"></script>
       <!-- React操作DOM的包 提供了一个对象 ReactDOM -->
     <script src="../react18/react-dom.development.js"></script>
     <style>
        .box{
            width: 400px;
            height: 400px;
            background-color: aquamarine;
            margin: 0 auto;
        }
     </style>
</head>
<body>
      <!-- React操作的容器 -->
      <div id="app"></div>
    <script>
         //创建一个虚拟DOM 案例1
        //  const vDom = React.createElement('h1',{className:"box"},'hello React')

          //创建一个虚拟DOM 案例2
        //   const vDom =React.createElement('h1',{className:"box"},'123','456','789') 
          //创建一个虚拟DOM 案例3
          const vDom =React.createElement('div',{className:"box"},React.createElement('h1',{className:"box"},'123'),React.createElement('p',{className:"box"},'456'))
          //把虚拟DOM交给React 渲染到容器中
          const root = ReactDOM.createRoot(document.getElementById('app'));
          root.render(vDom)
    </script>
</body>
</html>